Posted by sam on Tuesday, October 19, 2010 at 3:54am.
A ball is project from the building of height 250m, at angle 45degree below the horizontal with a speed of 25m/s.
i) how long does the ball remain in the air?
ii) find the magnitude and direction of the velocity of the ball just before it strikes the ground. (g=9.81m/s2)

physics  drwls, Tuesday, October 19, 2010 at 8:56am
i) Twice the time it takes for the vertical component to become zero.
T = 2*V*sin45/g
ii) The horizontal V component remains constant at Vcos 45 and the vertical component V sin 45 changes sign, but has the same magnitude at the ground, since kinetic energy is the same there.
Answer This Question
Related Questions
 Physics  A ball is tossed from an upperstory window of a building. The ball is...
 physics  A boy standing on top of a building throws a small ball from a height ...
 Physics Kinematics.  A ball is kicked with an initial velocity of 21 m/s in the...
 Physics Projectile Motion  A ball is kicked with an initial velocity of 21 m/s ...
 Physics  A boy throws a ball with an initial speed of 40.0 m/s. The angle of ...
 Physics  A soccer player kicks a ball at an angle 45degree with an initial ...
 physics  A ball is tossed from an upperstory window of a building. The ball ...
 Physics urgent pls!  A ball is tossed from an upperstorey window of a building...
 Physics  From the window of a building, a ball is tossed from a height y0 above...
 physics  A)A ball is tossed from an upperstory window of a building. The ball ...
More Related Questions